Compression coupling



Dfi. E932. A, C, DQBRICK 1,889,778

GOMPRESSION COUPLING Filed NOV. 5, 1928 I N VEN TOR ATTORNEY.

UNITED STATES PATENT oi-FICE Anouar c. nonnrcx, or cincneo, nmnzois COHPBESS10N COUPLING Application led November 5, 1988. Serial No. 817,868.

My invention is concerned with compres# sion couplings of the type in which an interiorly-threaded female member has a distorting shoulder beyond the thread, againstwhich shoulder the tapered end of the exteriorly-threaded male member is forced as it is screwed in place, to compress, as it were, said tapered end into, or into engagement with, the pipe passing through the male member and into the female member to which it is coupled.

I have found that the final turning of the tapered end on the -tube tends to crystallize or otherwise affect the tube so that it breaks oil in use within said tapered end much sooner than it should, and I remed this defect in my improved coupling by orming a deep annular groove in the male member between the tapered end and the adjacent end of the threaded portion, so that the tapered end 1s nearly severed from the rest of the male member. When the male member is screwed in, and its tapered end begins to be coinpressed into the tube by its contact with the distorting shoulder, the resistance offered to the continued rotation of the tapered end is suflicient to break the very thin annular web of metal connecting said tapered end with the body of said male member, with the result 3 thatthe tapered end ceases to rotate, but is l forced inward against the tube by a direct longitudinal thrust produced by the continued rotation of the body of the male member. Tests have demonstrated that a tube thus coupled is more durable than the old style, due presumably to there being less crystallization of the material of the tube than occurred with the old form. Moreover, it produces a joint than can be very readily removed, if desired, since the threaded portion of the male member is not in any wa jammed on the tube, although the detached tapered end is permanently secured thereon, but this does not prevent the tube being easily withdrawn from the. coupling whenV the male member is screwed out, and reinserted, if necessary or advisable.

To illustrate my invention, I annex hereto a sheet of drawings, in which the same reference characters designate identical parts in all the figures, of which,-

Fig. 1 is a central longitudinaksection showing my coupling in use' to connect two pipres endto' end; 55

ig. 2 is a similar view showing my coupling used to connect a pipe to a reservoir;

Fig. 3 is a view similar to Fig. 1, but showing the parts before the male members have been screwed into place;

Fi 4 is a side elevation of one of the male mem ers, partly broken away, in central vertical section; and

Fig. 5 is a similar view of the tapered end after it has been detached.

Where the female member is designed to couple two pipes end to end, as seen in Fig. 1, it consists of the cylindrical body portion 10, preferably7 having the iange 11 at its center, hexavona in cross section, so that a wrench 7 canA applied thereto. The bore therethrough at the center has what may be called an annular flange 12 projecting thereinto and forming the stop for the ends of the tubes 13 and. 14 to be connected, these tubes abutting 75 against the shoulders formed by the flange, and the diameter of the aperture 12 being preferably not less than the internal diameter ofthe tubes. On either side are the annular distorting shoulders 15, which are of the proper design so that when the tapered end of the male member is forced against such shoulder as it is screwed in place, the metal will be slightly distorted and forced inward 35' so as to engage and slightly compress the soft metal of the tube, as indicated in Figs. 1 and 2. From the shoulders 15 outwardly to the ends, the female member is internally threaded to co-operate with the external threads 16 of the male member, which preferably has y the hexagonal flange 17 on its end to which a wrench may be applied. Instead of the tapered end 18 increasing in diameter steadily until it merges into the threaded portion i through the metal, so that the tapered end is connected to the body portion of the male member by a very thin annular web, which breaks as soon as the action of the'tapered end 18 on the distorting shoulder 15 creates enough friction to offer an serious obstacle to the continued rotation o said tapered end 18. After it breaks, the continued turning of the male member brings the parallel walls of the now bottomless channel 19 together, 1 and the resistance to the rotation of said tapered end being greater than the friction between the vertical walls, the continued rotation of the male member sim ly forces the tapered *end in asy far as it will go without u anirther rotation thereof.

ere my invention is applied to connect a pipe 14 to a tank'20, asseen in Fig. 2, the

female member is modified as shown, having ,the reduced end threaded as seen, so as to be 5 stiir'lelgved into the threaded aperture in .the What I claim as new, and desire to secure by Letters Patent of the United States, is:

1. As a new and useful article of manufacture, a two-part pipe coupling comprising P internally threaded integral female memr tortin shoulder, and an integral externally threa ed male member adapted to be screwed 3 therein, and provided with an acutely tapered end adapted to coperate with said shoulder to.Y be forced there y -into intimate contact with the pipe to be cou led, said tapered end being connected with t e bod portion by a thin ortion that breaks off when the distortion ins so that said tapered end is not compeed to rotate on the i e whil distortion is being completed.p p e the o As a new and useful article of manufacre, a two-part pipe cou lin com risi an internally threaded intelgralgfemal iiieilhc-P ber provided with an internal annular disv torting shoulder, and an integral externally threaded male member adapted to be screwed therein, and provided with an acutely tapered end adapted to co-operate with said shoulder to be forced thereby into intimate contact with the pipe to be coupled, said l o tapered end being separated from the bod ortioii by a deep annular groove whic eaves only a thin annular connection that breaks oi when the distortion beings so that said tapered end is not compelled to rotate oili ttlei pipe while the distortion is being com- 3. As a new and useful article of manufacture, a twoart i e coupling comprising an internally-t rea e integral female member w provided with an internal annular distorting shoulder whose operative surface is convex in cross section, and an integral externallythreaded male member adapted to be screwedl therein, and provided with an acutely-tapered Il end adapted to co-operate with said shoulder provided with an internal annular dis-- `applying1 means to be forced thereby into intimate contact I with the i tobe cou led `saidta d end ling codnted with e bod podtidii by 4a n tion 'ns so that said ta red end is not com ed to rotate' on the lpipe while the distortion is being complete 4.' As a new and useful article of 'manufacture, a twoart ipe coupling comprising an internally-t rea ed integral fema e member provided with an 'internal annular distorting shoulder whose operative surface is convexl in cross section, and an integral externallythreaded male member adapted to be screwed' therein and provided with an acutelytapered end ada ted to co-'o erate with said shoulder to be orced there y into intimate.

contact with the pipe to be coupled, said Atapered end being connected with the bod portion by a deep annular groove' whic leaves only a thin annular connection that breaks 0E when the distortion begins so that said tapered end is not compelled to rotate on leted. w 5. As a new and useful article of manufacture, a male pipe-couplin member having three portions, one to whic a wrench can be applied; another a threaded -portion; and iinally an acutely tapered portion adapted to be deformed when applied to a ipe and connected to the threaded portion y a thinned the pipe while the distortion is being comrtion that breaks oif w en uhe distorweb portion adapted to be broken during said l application, substantially as and for the purpose descri 6. As a new and useful article of manufacture, a male pipe-couplin member having threeportions' one to whic a wrench can be applied; another a threaded portion; and,

finally an-acutely tapered portion adapted to be deformed when a plied to a pipe and connected to the threa ed portion by'a fragile portion adapted to be broken during said application su described. A 7 The method of coupling two cylindrical members which consists in forming one member with a threaded recess having a tapered inner end to receive the other member, then. a thinly-'connected double sleeve' unit to t e c lindrical member, the rear part of said unit being compressi le,l then forcin 4said unit into the' 'recess until the connection between its front and rear parts is broken, and then 'forcing the compressible part of the unit as a separate piece into the taperin end of the recess, by screwinghthe threade art of the unit further into t specified.

8. The method of connecting a soft metal cylindrical member to a fitting havin a threaded recess to receive the other mein r, said recess having atapering inner end which consists in applying to said cylindrical memstanti ally as and for the purpose in threaded and itsfront part e recess, for t e purpose.

ber a. compresion sleeve and a nut connected by 'a thin wall, then screwing the nut into the fitting to force the compression sleeve into said recess to break the thm wall between the sleeve and the nut, and thereafter screwing the nut further into the fitting to force the sleeve asa separate piece into the taer portion of the recess of the fitting, or tllli purpose specified.

In witness whereof, I have hereunto set my hand this 31st da of October, 1928.

AUG ST- C. DOBRICK. 

